Premium Gas, 91 Octane
- Thread starter sblesley
- Start date
My two cents - the $ difference is not worth going to anything below premium
93. Cause out here in Cowtown, it's 87, 89, or 93.
We cant get any of that fancy gas here - it's too powerful and dangerous. We get 91 and we'll like it as Judge Smails says.
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Hey - my buddy!! I want to go over there!!
Tundra makes more power and specs 87. GX makes less power and specs 91.
We're running 93 because I haven't read anything definitive about why this is the case, although looking at older models which use the same engine across the board (looking at V8's and 3.5's) Lexus tends to call for 91 while Toyotas are ok with 87. I get it, the GX reportedly has smaller turbos which makes sense as the Tundra's peak HP and Torque numbers are 400 RPM higher in the rev range versus the GX.
I know even less about the LX other than it lists even more peak HP, but with the same peak torque at the same RPM as the GX. I'm very interested in how Toyota is getting away with more advertised numbers with less octane and larger turbos.
Once the warranty is up, I'm going to look at aftermarket tuners to increase the boost and make use of the additional octane.
We're running 93 because I haven't read anything definitive about why this is the case, although looking at older models which use the same engine across the board (looking at V8's and 3.5's) Lexus tends to call for 91 while Toyotas are ok with 87. I get it, the GX reportedly has smaller turbos which makes sense as the Tundra's peak HP and Torque numbers are 400 RPM higher in the rev range versus the GX.
I know even less about the LX other than it lists even more peak HP, but with the same peak torque at the same RPM as the GX. I'm very interested in how Toyota is getting away with more advertised numbers with less octane and larger turbos.
Once the warranty is up, I'm going to look at aftermarket tuners to increase the boost and make use of the additional octane.
Who's the first to put regular octane gas on their GX550?
With debates on oil change intervals elsewhere, here is another pointless one, who has ventured into using regular 87 octane gasoline on their GX550? Keep it friendly please :)
www.lexusgxforum.com
Have been running 87 in my 550 from day 1 without issue as I did my 2022 460 for 33k miles. My dealer filled mine with 87 per the staff. Wish is still had my 460 …
Consumer Reports just tested the GX550 Premium. My bet is you wouldn't have any trouble with 87 octane unloaded but if you are towing 91 octane might be better. These V35A-fts engines are built very strong to take boost and this setup in the GX550 is torque and boost limited to the very conservative side.
Fuel Economy 2 / 5
CR's Overall Mileage 18 mpg
CR's City Mileage 12 mpg
CR's Highway Mileage 26 mpg
ANNUAL ENERGY/COST
Based on 12,000 annual mileage and national average gas prices
$2,699 - gas
Range (Gas) 370 mi.
Fuel Economy 2 / 5
CR's Overall Mileage 18 mpg
CR's City Mileage 12 mpg
CR's Highway Mileage 26 mpg
ANNUAL ENERGY/COST
Based on 12,000 annual mileage and national average gas prices
$2,699 - gas
Range (Gas) 370 mi.
Not sure I would take Consumer Reports word over the engineers at Toyota but it's your car.
I’m calling BS on the 26mpg Highway figure. Not doable unless your going downhill the whole time…
Uh oh.. not liking the 550?
Agree. That may have been a miss-type. My CR Road Test states 21 mpg for highway. City at 15 mpg. Combined at 17 mpg. This is for Premium fuel. Regular fuel mileage will be less. See attached screen print.
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I don't know what settings they had going, not what kind of flat track they were running and at what speed. But I can tell you that I'm getting a combined mpg of 14.7 on 92 octane. I got about 17/18 on a 500 mile trip that was mostly highway around 75mph. Id imagine that if one could stand to be annoying as can be, and accelerated like an electric Prius with a 90 year old driver, staying under 65mph and never passing. MAYBE you'd be able to get closer to 20 maybe..
GX550 Forum Photos
GX550 Forum Photos
